Sometimes the parking attendants will allow you through without paying just by showing the voucher. If not, as safetymom posted, you can get reimbursed at Guest Relations when you exchange your voucher for the actual pass.
I was originally going to DTD, but my husband is in a huge hurry to get to the Magic Kingdom. We've gotten concerned after reading reports that EMH is extremely crowded so we wanted to get started prior to MK closing.
Can't wait to get back to my favorite Duck in Philharmagic.